EP0769756B1 - Bilderzeugungsgerät - Google Patents

Bilderzeugungsgerät Download PDF

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Publication number
EP0769756B1
EP0769756B1 EP96116348A EP96116348A EP0769756B1 EP 0769756 B1 EP0769756 B1 EP 0769756B1 EP 96116348 A EP96116348 A EP 96116348A EP 96116348 A EP96116348 A EP 96116348A EP 0769756 B1 EP0769756 B1 EP 0769756B1
Authority
EP
European Patent Office
Prior art keywords
image data
supply
print
divided
memory means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96116348A
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English (en)
French (fr)
Other versions
EP0769756A2 (de
EP0769756A3 (de
Inventor
Shunichi c/o Fuji Xerox Co. Ltd. Kimura
Akihiro c/o Fuji Xerox Co. Ltd. Andoh
Setsu c/o Fuji Xerox Co. Ltd. Kunitake
Shinji c/o Fuji Xerox Co. Ltd. Shishido
Yutaka c/o Fuji Xerox Co. Ltd. Koshi
Koh C/O Fuji Xerox Co. Ltd. Kamizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
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Publication date
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Publication of EP0769756A2 publication Critical patent/EP0769756A2/de
Publication of EP0769756A3 publication Critical patent/EP0769756A3/de
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Publication of EP0769756B1 publication Critical patent/EP0769756B1/de
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/129—Colour printing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
    • G06K2215/0002—Handling the output data
    • G06K2215/002—Generic data access
    • G06K2215/0022—Generic data access characterised by the storage means used
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
    • G06K2215/0082—Architecture adapted for a particular function
    • G06K2215/0094—Colour printing

Definitions

  • the present invention relates to an image forming apparatus for dividing image data to print-process the latter, and particularly to an image forming apparatus for controlling a supply of divided image data to print means.
  • an image formed on the basis of image data is printed on a sheet of paper by electronic photographic process comprising a transfer process, a developing process, a fixing process. Since a process speed of the electronic photographic process is constant, parameters of the processes constituting the electronic photographic process are designed on the basis of a predetermined process speed. For thisreason, if the process speed is made variable, all the parameters of the processes concerned have to be made variable. This is not realistic.
  • the process speed is constant. Therefore, it is necessary to supply image data to print means (print engine) for forming an image from image data to print it on a sheet of paper at a constant speed according to the process speed.
  • print means print engine
  • supply timing of paper to the print means is deviated from supply timing of image data, and as a result, a white sheet of paper not printed with an image is ejected or a disturbed image is printed on a sheet of paper halfway.
  • image data in communicating image data or in storing image data in memory means, image data is coded in order to reduce a quantity of data, and in printprocessing it, the image data is decoded.
  • the supply speed of image data to the print means depends on an original, since generally a speed for coding process depends on an original, whereby matching of the supply timing of image data to the print means to the supply timing of a sheet of paper cannot be assured.
  • a coding system is a non-reversible coding system
  • control for a quantity of codes is made so that a constant quantity of codes is obtained per page whereby a decoding speed can be made constant.
  • an image which is hard to be coded for example, an image constituted at random noise
  • a normal image for example, a natural image such as a figure and a landscape
  • decoded image data is once retained in temporary memory means such as a buffer memory and the image data is supplied from the temporary memory means to the print means. Then, the supply of image data to the print means can be made at the speed corresponding to the process speed to prevent the situation such as ejection of white (unprinted) paper or printing of a disturbed image from occurring.
  • a page memory (a semiconductor memory) capable of storing image data for one page portion or more is provided so that image data for one page portion or two-page portion are temporarily stored whereby.image data are supplied to the print means according to the process speed.
  • image data for one page portion are stored in the page memory, after which a sheet of paper is fed from a paper feeder to the print means, and the print means prints images for one page portion on a sheet of paper fed on the basis of the image data stored in the page memory.
  • the operation of the storage of image data, the feed of a sheet of paper and the printing of images is repeatedly implemented per page.
  • recorders exclusive-use for color.
  • components 100Y, 100M, 100C and 100K are provided, and these recorders 100Y, 100M, 100C and 100K are operated in pipeline adjusting to the process speed with respect to sheets of paper conveyed by a paper conveyor 101 to thereby enabling a through-put of color print close to that of monochromatic print.
  • the through-put is enhanced by subjecting sheets of paper to pipeline processing.
  • the through-put becomes lowered.
  • a page memory for a portion of the number of sheets of originals is provided so that all the image data are prepared for the page memory, and after this, sheets of paper have to be fed to the pipeline. Because of this, when a page memory is constituted by a semiconductor memory, the greater part of printer cost is occupied by the cost of the semiconductor memory. Further, when a page memory is constituted by a magnetic disk, since a data transfer speed of the magnetic disk is greatly slow as compared with a recording speed, a plurality of magnetic disks have to be operated in parallel. Thus, the greater part of printer cost is occupied by the cost of the magnetic disks.
  • a page memory temporary memory means for a depth portion of a pipeline is necessary.
  • the storage of image data to the page memory should have been completed before the supply of sheets of paper.
  • the processing as shown in Fig. 20 is implemented.
  • the axis of abscissa indicates the time axis, in which below the timing at which a recording sheet of each page is processed, the capacity of a page memory required at that time is shown by the memory capacity (1 plane) for one page and one color.
  • image data (four planes) for color components, yellow (Y), magenta (M), cyan (C) and black (K) are decoded and retained in the page memory. Then, paper feeding process for conveying recording sheets to the head position of a row of recorders is implemented, after which sheets of paper are conveyed between the recorders 100Y, 100M, 100C and 100K, and the recording processes are sequentially implemented on the basis of the image data of color components. As a result, after the time of 6 units, images for one page are recorded one upon another on sheets of paper for color components, and the data retaining capacity of the page memory with respect to one page is vacant "0."
  • the second page In the state delayed by the time of one unit, the second page is processed in parallel, and in the state further delayed by the time of one unit, the third page is processed in parallel. In this manner, the capacity of the page memory which is necessary every completion of the recording process for one plane is reduced "1" by "1" and the pages are sequentially processed in parallel.
  • a page memory for a depth portion of a pipeline is necessary.
  • a page memory for 18 planes is necessary.
  • a page memory is constituted by a semiconductor memory which is high in access speed. Then, for example, in the case of image data having a resolution of JIS A4 format, 400 [dot/25.4 mm], and a gradation precision of each pixel 8 [bit/pixel], data quantity for one plane is about 16 [MByte]. Thus, a large capacity memory of about 288 [MByte] in total for 18 planes is necessary, resulting in a considerable increase in printer cost.
  • means for carrying out decoding and conversion process to supply image data to print means are present independently every color component. Therefore, loads cannot be dispersed even in the case where the loads of supplying image data are one-sided every color component. Therefore, in the case where a load in respect of a color component is large, even if there is room in image data supply means for carrying out decoding and data conversion process as a whole, there sometimes occurred the things in which print process by print means cannot be done.
  • An image processing apparatus is known from EP 480 638.
  • a computer plotter control is known from EP 427 466.
  • An object of the present invention is to provide an image forming apparatus which reduces a memory capacity necessary for temporarily retaining image data in order to carry out recording process without any inconvenience in print means.
  • a further object of the present invention is to provide an inexpensive image forming apparatus in which loads involved in supplying process of image data such as decoding and conversion process of data types are dispersed whereby the loads of image data supply means are reduced to perform the quick process.
  • an image forming apparatus divides an input image in parallel with a main scanning direction by image division means, stores said divided data in image data memory means, and supplies the divided image data from the image data memory means to image data temporary memory means by image data supply means for performing a decoding process or the like.
  • the image data temporary memory means temporarily retains the divided image data, and print means prints an image on a sheet of paper on the basis of the divided image data stored in the image data temporary memory means.
  • Prediction means predicts a supply process time by way of image data supply means
  • image data supply control means causes the image data supply means to start the supply process of the divided image data from the time preceded the time for the start of the print process by way of the print means according to the time predicted by image data supply control means.
  • the supply start time for the divided image data is controlled so that the supply of the image data to the print means is in time for the print process and the image data retained in the image data temporary memory . means is not insufficient, whereby the divided image data are continuously printed.
  • the print process is started at the same time when the divided image data are retained in the image data memory means.
  • the print process is started before the image data for one page portion is stored in the image data temporary memory means.
  • the divided image data is supplied at the appropriate time for the print process.
  • image division means divides a color image in parallel with a main scanning line and print means comprises a plurality of units for performing a print process with color ink corresponding to divided image data every color component.
  • the image data supply control means causes the image data supply means to start the supply process for the divided image data for color components from the time preceded the print process start time by way of the units of the print means whereby color image data divided in a pipeline color printer are continuously printed in a manner similar to that described above.
  • the image forming apparatus comprises a plurality of image data supply means, image data supply means selection means for selecting one out of said image data supply means used for a supply of the divided image data, and image data temporary memory means address selection means for determining an area address within the image data temporary memory means for storing the divided image data, to cause the image data supply means selected to transmit the divided image data from the image data memory means for a predetermined process and to transmit the divided image data from the image data supply means to the selected address area within the image data temporary memory means.
  • the individual divided image data are processed by the image data supply means independently of other divided image data, and the supply start time for the divided image data, the image data supply means and the image data temporary memory means are controlled so that the supply of the divided image data to the print means is in time for the print process and the number of the image data supply means and the amount of the image data temporary memory means are not insufficient whereby the divided image data are continuously printed.
  • the image division means divides a color image in parallel with a main scanning line
  • the print means comprises a plurality of units for performing a printing process with color ink corresponding to the divided image data every color component
  • print means selection means is provided to select which print means is used for the print process.
  • the image data supply control means causes the selected image data supply means to start the supply process for the divided image data for color components from the time preceded the print process start time by the selected unit of the print means according to the time predicted, whereby the divided color image data are continuously printed in a manner similar to that as described above.
  • the image forming apparatus further comprises a plurality of image data supply means, the same number of image data temporary memory means as that of the former, and image data temporary memory means selection means for selecting one of the image data temporary memory means used to supply the divided image data to the print means.
  • the image data supply control means causes the selected image data supply means to supply and process individual divided image data independently of other divided image data according to the time predicted and fixedly retains the divided image data supplied from the image data supply means'in the same image temporary memory means.
  • the supply start time for the divided image data, the image data supply means and the image data temporary memory means are controlled so that the supply of the divided image data to the print means is in time for the print process and the number of the image supply means and the amount of the image data temporary memory means is not insufficient whereby the divided image data are continuously printed.
  • the image division means divides a color image in parallel with a main scanning line
  • the print means comprises a plurality of units for performing a printing process with color ink corresponding to the divided image data every color component
  • print means selection means is provided to select which print means is used for the print process.
  • the image data supply control'means causes the selected image data supply means to start the supply process for the divided image data for color components from the time preceded the print process start time by the selected unit of the print means according to the time predicted and to retain the supplied and processed divided image data in the selected image data temporary memory means whereby the divided color image data are continuously printed in a manner similar to that as described above.
  • the image forming apparatus further comprises feed paper control means for delaying a feed paper timing for a sheet of paper on the basis of the state where the divided image data to be printed is not yet stored in the image data temporary memory means wherein in the case where the print process cannot be made due to the fact that the number of image data supply means or the capacity of the image temporary memory means is insufficient, the print start time is delayed to enable the print process.
  • the paper feed control means controls the paper feed start time adjusting to the print start time of a paper to thereby open the page subjected to the print process to render the print possible.
  • the prediction means obtains the supply start time for the divided image data by retracing the time from the print start time of the last divided image data of the page to be printed finally prior to the print process by the print means and the image data supply control means calculates the number of the image data supply means and the capacity of the image data temporary memory means every time unit to examine the print possibility. In the case where print is impossible, the print start, time of the page is delayed to render the print possible.
  • the decoding start time is determined so as to be in time for the print start time of the divided image data to be printed finally of the last page
  • the second decoding start time from the last is determined so as to be in time for the print start time of the second image data from the last.
  • the second decoding start time from the last is quickened till the capacity and the number of the decoding means and the image data temporary memory means are not insufficient.
  • the thereafter decoding start time for the divided image data is likewise determined.
  • the print start time for a next page is delayed.
  • the image data memory means further comprises coding means for information source coding image data and coded data memory means for storing coded data
  • the image data supply means comprises image decoding means for decoding coded data, whereby the divided image data are information source coded and stored, and when the divided image data are supplied, the coded data are decoded and supplied.
  • the input image data is divided and coded, they can be independently decoded by image data supply means, and the divided image data can be decoded in parallel. Further, the order for starting decoding can be changed. Therefore, it is possible to decode the divided image data at time intervals which can most effectively make use of the number of image decoding means (decoders) given in advance and the capacity of the image data temporary memory means. Further, since the decoding time is known in advance by the prediction means, it is possible to obtain the decoding start time of most effective image data. The print process can be performed without the need of storage of image data for one page portion.
  • the prediction means predicts the decoding time by using the quantity of codes of the divided coded image data.
  • the prediction means predicts the decoding time by using the process speed by way of the coding means.
  • the prediction means predicts the decoding time by using the number of coded symbols of the divided image data.
  • the number of coded symbols herein termed is, in a high efficiency coding system combined with an entropy coding system, the number of symbols for the object for the entropy coding after reduction in redundancy. For example, this indicates the number of symbols for the object for Houghman coding in a JPEG system of ITU-T standards.
  • the prediction means measures the decoding time obtained when the decoding process is performed in advance by the image decoding means instead of the prediction of the decoding time.
  • Fig. 1 is a constitutional view of an image forming apparatus according to a first embodiment of the present invention.
  • the image forming apparatus comprises image division means 2 for dividing input image data 1 'in a direction of a main scanning line, image memory means 3 for storing the divided image data, image data supply means 4 for removing the divided image data from the image memory means 3 to perform a predetermined supply process, supply time predication means 5 for predicting the time necessary for the image data supply means 4 to supply and process the divided image data, supply time memory means 6 for storing the time predicated by the supply time prediction means 5, image data supply control means 7 for controlling the start time of the supply and process by the image data supply means 4, image data temporary memory means 8 for temporarily storing the divided image data supplied from the image data supply means 4, and print means 9 for printing an image on a sheet of paper on the basis of the image data temporarily stored in the image data temporary memory means 8.
  • the input image data 1 is monochromatic image data. This image data is continuously input in one-dimension in a direction of a main scanning line as shown in Fig. 2A.
  • the image division means 2 divides the image data in a direction of a main scanning line as shown in Fig. 2B into a plurality of divided image data 10, each divided image data 10 being stored in the image memory means 3.
  • the image data supply means 4 decodes the divided image data being coded in the supply processing, and the supply time predication means 5 predicts the time required for the decoding process by the image data supply means 4 on the basis of the quantity of codes and the number of coded symbols of the divided image data being stored in the image memory means 3.
  • the supply time memory means 6 records the supply time predicated by the prediction means 5, and the image data supply control means 7 causes the image data supply means 4 to start the supply processing of the divided image from the time preceding to the print process start time by the print means 9, according to the supply time stored in the memory means 6.
  • the print processing by the image forming apparatus constructed as described above is carried out in the procedure shown in Fig. 3.
  • the present embodiment shows the case where image data for one page portion is divided into four divided image data by the image division means 2. These divided images 1 - 4 are subjected to the print processing in order as shown in the figure.
  • the image data supply control means 7 arithmetically calculates how long preceding from the print start time by the print means 9 to cause the image data supply means 4 to start the supply processing, on the basis of the prediction time stored in the supply time memory means 6, and causes the image data supply means 4 to start the supply processing on the basis of the calculated results to store the divided image data 1- 4 in the image data temporary memory means 8.
  • the divided image data 1 - 4 are prepared for the image data temporary memory means 8 prior to start the printing by the print means 9, and the image based on the divided image data 1 - 4 are continuously printed on sheets of paper being supplied by the print means 9.
  • the image data temporary memory means 8 for storing all the image data for one page portion is not required by dividing and processing the image data, and the divided image data can be supplied to the print means 9 so that the printing can be done without trouble by predicting the time required for supply and processing (decoding processing) the divided image data.
  • Fig. 4 is a constitutional view of an image forming apparatus according to a second embodiment of the present invention.
  • the same parts as those in the above-described first embodiment are indicated by the same reference numerals, and a duplicated description is omitted.
  • the image forming apparatus is a pipeline color printer for printing a color image on a sheet of paper on the basis of color image data.
  • the print means comprises yellow ink color print means 9Y for printing yellow ink, magenta ink print means 9M for printing magenta ink, cyan ink print means 9C for printing cyan ink, and black ink print means 9K for printing black ink.
  • the image division means 2 divides color image data 1 for one page portion in parallel in a direction of a main scanning line, and divides each divided image data every color component of yellow (Y), magenta (M), cyan (C) and black (K).
  • the image memory means 3 stores the image data every divided image data of each color component
  • the image data supply means 4 supplies arid processes the divided image data of each color component to store them in the image data temporary memory means 8.
  • the supply time prediction means 5 predicts the time required for the image datasupply means 4 to supply and process every divided image data of each color component
  • the supply time memory means 6 stores the time predicted every divided image data of each color component.
  • the image data supply control means 7 controls a supply of the divided image data every color component by the image data supply means 4 so that the yellow print means 9Y performs the print processing corresponding to the yellow divided image data from the image data temporary memory means 8, the magenta print means 9M performs the print processing corresponding to the magenta divided image data from the image data temporary memory means 8, the cyan print means 9C performs the print processing corresponding to the cyan divided image data from the image data temporary memory means 8, the black print means 9M performs the print processing corresponding to the black divided image data from the image data temporary memory means 8.
  • the image forming apparatus according to the present embodiment is realized as a tandem type color printer as shown in Fig. 5.
  • toner images every color component are formed by four print means unit 9Y, 9M, 9C and 9K corresponding to colors of yellow (Y), magenta (M), cyan (C) and black (K), and the thus formed toner images are sequentially transferred to sheets of paper being conveyed by a sheet conveying device 11 of a transfer conveying belt system to form color images.
  • Each of the print means units 9Y, 9M, 9C and 9K comprises a charger 13, a laser scanning unit 14, a developing unit 15 and a cleaner 16 which are arranged in the periphery of a photosensitive drum 12. Toner images every color component are formed on the photosensitive drum 12 via the steps of charging, exposure and development, and the toner images are electrostatically transferred to recording sheets carried on the sheet conveying device 11.
  • the sheet conveying device 11 has a transfer conveying belt extended over a plurality of rolls including a drive roll. In the vicinity of the transfer conveying belt are disposed a charger 17 for electrostatically adsorbing a recording sheet being fed from a supply tray not shown on the surface of the belt, a transfer corotron 18 for electrostatically transferring a toner image formed on each of the print means units 9Y, 9M, 9C and 9K to a recording sheet, an antistatic corotron 19 for eliminating electricity from the recording sheet electrostatically adsorbed on the belt, and an antistatic corotron 20 for eliminating electricity from the belt after the recording sheet has been stripped off.
  • a charger 17 for electrostatically adsorbing a recording sheet being fed from a supply tray not shown on the surface of the belt
  • a transfer corotron 18 for electrostatically transferring a toner image formed on each of the print means units 9Y, 9M, 9C and 9K to a recording sheet
  • an antistatic corotron 19 for eliminating electricity from the
  • the divided image data every color are supplied from the image data temporary memory means 8 to the laser scanning unit 14 of each of the print means units 9Y, 9M, 9C and 9K so that in each of the print means units 9Y, 9M, 9C and 9K, toner images every color component is formed on the photosensitive drum.
  • These toner images are sequentially transferred to the recording sheets being conveyed to form a color image in which toner images of color components are placed one upon another on the recording sheet.
  • the recording sheet stripped off from the transfer conveying belt 11 is ejected to an ejection tray not shown via a fixing unit 21.
  • the image data temporary memory means 8 for storing all the image data for one page portion is not required by dividing and processing the image data, and the divided image data of color components can be supplied to the print means 9Y, 9M, 9C and 9K so that the printing can be done without trouble by predicting the time required for supply and processing (decoding processing) the divided image data of color components.
  • Fig. 6 is a constitutional view of an image forming apparatus according to a third embodiment of the present invention.
  • the same parts as those in the above-described first embodiment are indicated by the same reference numerals, and a duplicated description is omitted.
  • the image forming apparatus is a printer for printing an image on a sheet of paper on the basis of monochromatic image data, which is provided with two image data supply means 4a and 4b.
  • the image forming apparatus comprises, in addition to the constitution of the first embodiment, image data supply means selection means 31 for selecting image data supply means for supply- and processing divided image data out of the two image data supply means 4a and 4b, and address selection means 32 for designating an address within the image data temporary memory means for storing the divided image data.
  • the image storage means 3 stores divided image data in a manner capable of supplying independently of other divided image data, and the image data supply means selection means 31 for selecting one out of the image data supply means 4a and 4b which is not at present being subjected to supply- and processing to transmit the divided image data from the image memory means 3.
  • the address selection means 32 designates a memory area address within the image data temporary memory means 8 so as to reserve the order of supplying the divided image data divided into the image data supply means 4a and the image data supply means 4b whereby the divided image data are stored in the image data temporary memory means 8 while holding the order. Further, the print means 9 performs printing corresponding to the order of the divided image data within the image data temporary memory means 8 to print and reproduce an original image on a sheet of paper.
  • the image data temporary memory means 8 for storing all the image data for one page portion is not required by dividing and processing the image data, and a plurality of image data supply means 4 for supply- and processing (decoding processing) divided image data is provided to disperse loads and speed up the supply and processing speed. Further, the time required for processing the image data supply means 4a and 4b is predicted in a manner similar to that previously mentioned whereby the divided image data can be supplied to the print means 9 so as to perform the print processing without trouble.
  • Fig. 7 is a constitutional view of an image forming apparatus according to a fourth embodiment of the present invention.
  • the same parts as those in the above-described first embodiment are indicated by the same reference numerals, and a duplicated description is omitted.
  • the image forming apparatus is a pipeline color printer for printing a color image on a sheet of paper on the basis of color image data input, which is provided with print means selection means 33 for selecting print means used for print processing according to color components of divided image data out of yellow ink print means 9Y, magenta ink print means 9M, cyan print means 9C and black ink print means 9K.
  • the image data temporary memory means 8 for storing all the image data for one page portion is not required by dividing and processing the image data, and a plurality of image data supply means 4 for supply- and processing (decoding processing) divided image data is provided to disperse loads and speed up the supply and processing speed. Further, the time required for processing the image data supply means 4a and 4b is predicted in a manner similar to that previously mentioned and print means according to color components of divided images is selected whereby the divided image data can be supplied to the print means so as to perform the print processing without trouble of color images.
  • Fig. 8 is a constitutional view of an image forming apparatus according to a fifth embodiment of the present invention.
  • the same parts as those in the above-described third embodiment are indicated by the same reference numerals, and a duplicated description is omitted.
  • the image forming apparatus is a printer for printing an image on a sheet of paper on the basis of monochromatic image data input, which is provided with image data supply means selection means 31 for selecting image data supply means for supply- and processing divided image data out of two image data supply means 4a, 4b and two image data supply means 4a, 4b, and in addition, selection means 34 for selecting image data temporary memory means used for storing divided image data out of two image data temporary memory means 8a, 8b and two image data temporary memory means 8a, 8b.
  • an area of a single image data memory means is designated in address to temporarily store divided image data supplied from a plurality of image data supply means 4a, 4b in the order.
  • adequate image data memory means is selected out of a plurality of image data temporary memory means 8a or 8b so that a plurality of image data temporary memory means 8a, 8b is made to correspond to a plurality of image data supply means 4a, 4b at a ratio of 1 to 1, and the order of an original image is reserved by the image data temporary memory means selection means 34, whereby the print means 9 prints and reproduces an original image in the order on the basis of the divided image data supplied from the plurality of image data supply means 4a, 4b.
  • the image data temporary memory means 8 for storing all the image data for one page portion is not required by dividing and processing the image data, and a plurality of image data supply means 4 for supply- and processing (decoding processing) divided image data is provided to disperse loads and speed up the supply and processing speed. Further, the time required for processing the image data supply means 4a and 4b is predicted in a manner similar to that previously mentioned and image data temporary memory means is selected whereby the divided image data can be supplied to the print means 9 so as to perform the print processing without trouble.
  • Fig. 9 is a constitutional view of an image forming apparatus according to a sixth embodiment of the present invention.
  • the same parts as those in the above-described fourth and fifth embodiments are indicated by the same reference numerals, and a duplicated description is omitted.
  • the image forming apparatus is a pipeline color printer for printing a color image on a sheet of paper on the basis of color image data input, which is provided, in addition to the constitution of the fifth embodiment, with print means selection means 33 for selecting yellow ink print means 9Y, magenta ink print means 9M, cyan print means 9C and black ink print means 9K, and print means used for print processing according to color components of divided image data out of the print means 9Y, 9M, 9C and 9K.
  • image data temporary memory means 8a, 8b are selected by the image data temporary memory means selection means 34 so as to reserve the order of the divided image data every color component
  • print means 9Y, 9M, 9C and 9K are selected by the print means selection means 33 so as to perform printing on the basis of adequate divided image data of color components.
  • the image data memory means 3 comprises coding means for information-source coding image data, and coded data memory means (coding buffer) for storing coded image data.
  • the image data supply means 4a, 4b of the present embodiment has image decoding means for decoding coded image data.
  • reference numeral 41 designates a CPU for performing control; 42 a CPU bus; 43 a magnetic disk; 44 a code bus for transmitting code data; 45 an image bus for transmitting image data; 46 and 47 coding and decoding circuit and code buffer; 48 and 49 image buffers; 50 a scanner device; 9Y a yellow print device; 9M a magenta print device; 9C a cyan print device; and 9K a black print device.
  • Image division means 2 and supply time predication means 5 are realized by a software activated by the CPU 41, and image data supply control means 7 is realized b using the soft ware and the code bus 44. Further, code data memory means of image data memory means 3 and supply time memory means 6 are realized by the magnetic disk 43, and coding means of the image data memory means 3 is realized by the coding and decoding circuit and the code buffers 46 and 47. Image data temporary memory means 8a and 8b are realized by the image buffers 48 and 49, and the image data supply means selection means 31 is realized by the software activated by the CPU 41 and the code bus 44. The image data temporary memory selection means.34 and the print means selection means 33 are realized by the software and the image bus 45.
  • the image data 1 input is divided from the scanner device 50 and taken in, and thence input into the image buffer 48 or 49.
  • the CPU 41 causes the coding and decoding circuit and the code buffers 46 and 47 to start to code the image data, independently coding the divided image data sequentially and storing them in the magnetic disk 43.
  • the code data (divided image data) stored in the magnetic disk 43 is input in the coding and decoding circuit and the code buffer 46 or 47 using the code bus 44, and the code data is decoded.
  • the same algorithm as the coded algorithm is used, and for example, a JPEG system of ITU-T standard is used as the coding and decoding algorithm.
  • the decoded divided image data are transferred to the image data temporary memory means 8a or 8b by designating a transfer source and a transfer destination by the image bus 45 so that the order of images is preserved and the data are transferred to the adequate print devices 9Y, 9M, 9C and 9K of color components, and then subjected to print processing by the adequate print devices 9Y, 9M, 9C and 9K.
  • Fig. 11 is a view showing another concrete constitutional example of the sixth embodiment according to the present invention.
  • an image buffer 51 is used in place of the image buffers 48 and 49 in the constitutional example shown in Fig. 10.
  • the image data temporary memory means selection means 34 and the print means selection means 33 are realized by the software activated by the image bus 45 and the CPU 41.
  • Figs. 12 to 14 show the procedures for the processing of the divided image data supply in the above-described embodiments.
  • feed paper control means which delays a feed paper timing of sheets by the feed paper device 11 to delay the print start time by the print means in the state where divided image data to be printed are not yet stored in the image data temporary memory means.
  • Fig. 12 shows a state of the print time and the supply time of divided image data in the monochromatic print operation in which one page is divided into four divided image data to continuously print a plurality of pages.
  • the print processing timing between the pages is vacant for a predetermined period of time, and at the time of print processing, the pages are continuously printed at fixed intervals, and the divided image data are continuously printed within the page.
  • the feed paper timing of sheets with respect to the next page is delayed by the feed paper control means so that as shown in Fig. 13, the print processing timing between the previous page and the next page is made vacant for a predetermined time or more. That is, since the print processing timing with respect to the next page is delayed by making large a gap between pages, a lapping amount between the divided image data to be held in the image data temporary memory means with respect to the previous page and the divided image data to be held in the image data temporary memory means with respect to the next page reduces, and the maximum value of the capacity demanded by the image data temporary memory means is reduced to 3 to enable the continuous print processing by the print means.
  • the feed paper timing of sheets with respect to the next page is delayed by the feed paper control means so that as shown in Fig. 14, the print processing timing between the previous page and the next page is made vacant for a predetermined time or more. That is, since the print processing timing with respect to the next page is delayed by making large a gap between pages, the maximum number of the image data supply means required is 1 to enable the continuous print processing by the print means.
  • the termination time of the print processing is taken at the starting point "0," the time to the start time of the print processing is computed retracing the time, and the time is quantized into an integer time for handling.
  • the print processing with respect to the divided images is carried out in order of black (K), yellow (Y), magenta (M) and cyan (C), as shown in Fig. 15, and in the case of retracing the time, the decoding processing (supply processing) is carried out in order of numbers shown in the figure by the image data supply means.
  • computation is carried out in order of numbers shown in Fig. 15, printing starts at time n and printing terminates at time "0." While the n is actually negative time, it is positive time for the convenience' sake of computation.
  • m is the print start time with respect to the divided image data of a certain color component
  • it is added to the waiting queue of the decoding process by the image data supply and processing means.
  • the "wait" is already present in the decoding waiting queue, the following processing is carried out. If the data storage amount of the image data temporary memory means is less than the maximum value and the image data supply means (decoder) is vacant, the decoding starts so as to terminate the decoding processing at the time m. In the case where a plurality of "wait"s are present, the shortest decoding time is selected.
  • the data storage amount of the image data temporary memory means is reduced by 1.
  • the divided image data of color components are printed after being decoded.
  • a decoder image data supply means is necessary from the decoding start time to the decoding terminal time.
  • the capacity for a portion for storing divided image data for one color component is necessary for the image data temporary memory means from the decoding start time to the print termination time.
  • This procedure is to obtain the decoding time with respect to the divided image data of color components in the case where the number of decoders (image data supply means) and the capacity of the image data temporary memory means are limited.
  • the print termination time of the divided image data of color components is the decoding start time
  • the capacity is increased and decreased.
  • the capacity increases at a certain time, with respect to the capacity at the later time, the increased capacity is continuously used as it is unless it is clearly decreased.
  • n is at a point C
  • the printing with respect to the last divided image data of the color component cyan (C) (a portion "1" in Fig. 17) is started. If at this time, if the decoder (image data supply means) is left, the time for starting the decoding so that the decoding is terminated at the point C is determined. In this case, if the decoding starts at a point D, it terminates at the point C, in which case, the point D is the decoding start time.
  • n is at a point D
  • the decoding is started.
  • the capacity is reduced by 1.
  • Similar processing is carried out also for the decoding start time of the divided image data of color components. For example, in the case where a decoder is not left at the printing start time point E of the.divided image data two before the last color component magenta (M) (a portion "3" in Fig. 17), it is necessary to delay the decoding termination time till the time (point F) at which a decoder is left. In this case, therefore, the decoding start point is a point G.
  • the prediction means 5 instead of obtaining the decoding time by the image data supply means 4 by way of the predication as described above, in the prediction means 5, the coded divided image data is once decoded by the image data supply means 4, and the decoding time at that time is measured whereby the decoding time by the thereafter image data supply means may be predicted.

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  • Theoretical Computer Science (AREA)
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  • Record Information Processing For Printing (AREA)
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Claims (15)

  1. Bilderzeugungsvorrichtung, die umfasst:
    eine Bildunterteilungseinrichtung (2), die ein Eingangsbild parallel in einer Richtung einer Hauptabtastlinie unterteilt;
    eine Bilddatenspeichereinrichtung (3), die Daten des unterteilten Bildes speichert;
    eine Bilddatenzuführeinrichtung (4), die die Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) zuführt;
    eine Bilddatenzwischenspeichereinrichtung (8), die die zugeführten Daten des unterteilten Bildes zwischenspeichert;
    eine Druckeinrichtung (9), die auf der Basis der in der Bilddatenspeichereinrichtung (3) gespeicherten Daten des unterteilten Bildes Drucken auf ein Blatt Papier ausführt;
    eine Vorhersageeinrichtung (5), die eine Zuführ-und-Verarbeitungs-Zeit durch die Bilddatenzuführeinrichtung (4) vorhersagt, dadurch gekennzeichnet, dass die Vorrichtung eine Bilddatenzuführ-Steuereinrichtung (7) umfasst, die bewirkt, dass die Bilddatenzuführeinrichtung (4) mit dem Zuführen und Verarbeiten der Daten des unterteilten Bildes entsprechend der vorhergesagten Zuführ-und-Verarbeitungs-Zeit von der der Druckverarbeitungs-Anfangszeit durch die Druckeinrichtung (9) vorangehenden Zeit an beginnt.
  2. Bilderzeugungsvorrichtung, die umfasst:
    eine Bildunterteilungseinrichtung (2), die ein Eingangsfarbbild parallel in einer Richtung einer Hauptabtastlinie unterteilt;
    eine Bilddatenspeichereinrichtung (3), die Daten des unterteilten Bildes speichert;
    eine Bilddatenzuführeinrichtung (4), die die Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) zuführt;
    eine Bilddatenzwischenspeichereinrichtung (8), die die zugeführten Daten des unterteilten Bildes zwischenspeichert;
    eine Druckeinrichtung (9Y, 9M, 9C, 9K), die aus einer Vielzahl von Einheiten besteht und Druckfarben, die Farbkomponenten-Bilddaten entsprechen, auf der Basis der in der Bilddatenzwischenspeichereinrichtung (8) gespeicherten Daten des unterteilten Bildes übereinander aufträgt und selbiges aufzeichnet;
    eine Vorhersageeinrichtung (5), die eine Zuführ-und-Verarbeitungs-Zeit durch die Bilddatenzuführeinrichtung (4) vorhersagt, dadurch gekennzeichnet, dass die Vorrichtung eine Bilddatenzuführ-Steuereinrichtung (7) umfasst, die bewirkt, dass die Bilddatenzuführeinrichtung (4) mit dem Zuführen und Verarbeiten der Daten des unterteilten Bildes aus Farbkomponenten entsprechend der vorhergesagten Zuführ-und-Verarbeitungs-Zeit von der der Druckverarbeitungs-Anfangszeit durch die Einheiten vorangehenden Zeit an beginnt.
  3. Bilderzeugungsvorrichtung nach Anspruch 1 oder 2, die des Weiteren eine Bilddaten-Vorverarbeitungseinrichtung umfasst, die die Daten des unterteilten Bildes vor dem Speichern der Daten des unterteilten Bildes in der Bilddatenspeichereinrichtung (3) verarbeitet,
    wobei die Vorhersageeinrichtung (5) eine Zuführ-und-Verarbeitungs-Zeit durch die Bilddatenzuführeinrichtung (4) auf der Basis des Verarbeitungsergebnisses der Daten des unterteilten Bildes durch die Bilddaten-Vorverarbeitungseinrichtung vorhersagt.
  4. Bilderzeugungsvorrichtung nach Anspruch 1 oder 2, wobei die Bilddatenspeichereinrichtung (3) eine Kodierungseinrichtung für die Informationsquellenkodierung von Bilddaten und eine Speichereinrichtung für kodierte Daten zum Speichern kodierter Bilddaten umfasst,
    die Bilddatenzuführeinrichtung (4) eine Bilddekodiereinrichtung zum Dekodieren der kodierten Bilddaten umfasst, und
    die Vorhersageeinrichtung (5) eine Einrichtung umfasst, die die Dekodierzeit der kodierten Daten des unterteilten Bildes vorhersagt oder misst,
    wobei die Bilddaten kodiert und gespeichert sowie dekodiert werden, wenn die Daten des unterteilten Bildes zugeführt werden.
  5. Bilderzeugungsvorrichtung nach Anspruch 4, wobei die Vorhersageeinrichtung (5) die Dekodierzeit auf der Basis der Menge an Codes der Daten des unterteilten Bildes vorhersagt.
  6. Bilderzeugungsvorrichtung nach Anspruch 4, wobei die Vorhersageeinrichtung (5) die Dekodierzeit auf der Basis der Verarbeitungszeit durch die Kodiereinrichtung vorhersagt.
  7. Bilderzeugungsvorrichtung nach Anspruch 4, wobei die Vorhersageeinrichtung (5) die Dekodierzeit auf der Basis der Anzahl kodierter Symbole der Daten des unterteilten Bildes vorhersagt.
  8. Bilderzeugungsvorrichtung nach Anspruch 4, wobei die Vorhersageeinrichtung (5) die Dekodierzeit vorhersagt, die durch Ausführen des Vorkodierungsvorgangs mittels der Bilddekodiereinrichtung erreicht wird.
  9. Bilderzeugungsvorrichtung nach Anspruch 1, wobei die Bilderzeugungsvorrichtung umfasst:
    eine Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b), die einzelne Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) unabhängig von anderen Daten des unterteilten Bildes zuführen;
    eine Bilddatenzuführeinrichtungs-Auswähleinrichtung (31), die aus der Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b) Bilddatenzuführeinrichtungen auswählt, die die Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) zuführen; und
    eine Bilddatenzwischenspeichereinrichtungsadressen-Auswähleinrichtung (32), die eine Bereichsadresse in der Bilddatenzwischenspeichereinrichtung (8) zum Speichern der Daten des unterteilten Bildes bestimmt.
  10. Bilderzeugungsvorrichtung, die umfasst:
    eine Bildunterteilungseinrichtung (2), die ein Eingangsfarbbild parallel in einer Richtung einer Hauptabtastlinie unterteilt;
    eine Bilddatenspeichereinrichtung (3), die Daten des unterteilten Bildes speichert;
    eine Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b), die einzelne Daten des unterteilen Bildes aus der Bilddatenspeichereinrichtung (3) unabhängig von anderen Daten des unterteilten Bildes zuführen;
    eine Bilddatenzuführeinrichtungs-Auswähleinrichtung (31), die aus der Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b) Bilddatenzuführeinrichtungen auswählt, die die Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) zuführen;
    eine Bilddatenzwischenspeichereinrichtung (8), die die zugeführten Daten des unterteilten Bildes zwischenspeichert;
    eine Bilddatenzwischenspeichereinrichtungsadressen-Auswähleinrichtung (32), die eine Bereichsadresse in der Bilddatenzwischenspeichereinrichtung zum Speichern der Daten des unterteilten Bildes bestimmt;
    eine Druckeinrichtung (9Y, 9K, 9C, 9K), die aus einer Vielzahl von Einheiten besteht, und die Druckfarben, die Farbkomponenten-Bilddaten von Farbkomponenten entsprechen, auf der Basis der in der Bilddatenzwischenspeichereinrichtung gespeicherten Daten des unterteilten Bildes übereinander aufträgt und selbiges aufzeichnet;
    eine Druckeinrichtungs-Auswähleinrichtung (33), die die von der Bilddatenspeichereinrichtung (3) ausgegebenen Daten des unterteilten Bildes für eine der Speichereinrichtungen zuführt bzw. auswählt; und
    eine Vorhersageeinrichtung (5), die eine Zuführ-und-Verarbeitungs-Zeit durch die entsprechende Bilddatenzuführeinrichtungen (4a, 4b) vorhersagt; und
    eine Bilddatenzuführ-Steuereinrichtung (7), die bewirkt, dass jede Bilddatenzuführeinrichtung (4a, 4b) mit dem Zuführen von Daten des unterteilten Bildes aus Farbkomponenten entsprechend der vorhergesagten Zuführ-und-Verarbeitungs-Zeit von der der Druckverarbeitungszeit durch die Einheiten vorangehenden Zeit an beginnt.
  11. Bilderzeugungsvorrichtung, die umfasst:
    eine Bildunterteilungseinrichtung (2), die ein Eingangsbild parallel in einer Richtung einer Hauptabtastlinie unterteilt;
    eine Bilddatenspeichereinrichtung (3), die die Daten des unterteilten Bildes speichert;
    eine Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b), die einzelne Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) unabhängig von anderen Daten des unterteilten Bildes zuführen;
    eine Bilddatenzuführeinrichtungs-Auswähleinrichtung (31), die Bilddatenzuführeinrichtungen (4a, 4b) zum Zuführen der Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) auswählt;
    Bilddatenzwischenspeichereinrichtungen (8a, 8b), die in der gleichen Anzahl vorhanden sind wie die Bilddatenzuführeinrichtungen (4a, 4b) und die zugeführten Daten des unterteilten Bildes zwischenspeichern;
    eine Druckeinrichtung (9), die auf der Basis der in der Bilddatenspeichereinrichtung (3) gespeicherten Daten des unterteilten Bildes Drucken auf ein Blatt Papier ausführt;
    eine Bilddatenzwischenspeichereinrichtungs-Auswähleinrichtung (34), die Bilddatenzwischenspeichereinrichtungen zum Zuführen von Daten des unterteilten Bildes zu der Druckeinrichtung (9) auswählt;
    eine Vorhersageeinrichtung (5), die eine Zuführ-und-Verarbeitungs-Zeit durch die Bilddatenzuführeinrichtungen vorhersagt; und
    eine Bilddatenzuführ-Steuereinrichtung (7), die bewirkt, dass die entsprechende Bilddatenzuführeinrichtung die Daten des unterteilten Bildes entsprechend der vorhergesagten Zuführ-und-Verarbeitungs-Zeit von der der Druckverarbeitungs-Anfangszeit durch die Druckeinrichtung (9) vorangehenden Zeit an unveränderlich der gleichen Bilddatenzwischenspeichereinrichtung (8a, 8b) zuführt.
  12. Bilderzeugungsvorrichtung, die umfasst:
    eine Bildunterteilungseinrichtung (2), die ein Eingangsfarbbild parallel in einer Richtung einer Hauptabtastlinie unterteilt;
    eine Bilddatenspeichereinrichtung (3), die Daten des unterteilten Bildes speichert;
    eine Vielzahl von Bilddatenzuführeinrichtungen (4a, 4b), die einzelne Daten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) unabhängig von anderen Daten des unterteilten Bildes zuführen;
    eine Bilddatenzuführeinrichtungs-Auswähleinrichtung (31), die Bilddatenzuführeinrichtungen (4a, 4b) zum Zuführen der Bilddaten des unterteilten Bildes aus der Bilddatenspeichereinrichtung (3) auswählt;
    Bilddatenzwischenspeichereinrichtungen (8a, 8b), die in der gleichen Anzahl vorhanden sind wie die Bilddatenzuführeinrichtungen (4a, 4b) und die zugeführten Daten des unterteilten Bildes zwischenspeichern;
    eine Druckeinrichtung (9Y, 9M, 9C, 9K), die aus einer Vielzahl von Einheiten für entsprechende Farbkomponenten bestehen und auf der Basis der in der Bilddatenzwischenspeichereinrichtung gespeicherten Daten des unterteilten Bildes Druckfarben, die den Daten des unterteilten Bildes der entsprechenden Farbkomponenten entsprechen, übereinander auftragen, um so selbiges aufzuzeichnen;
    eine Bilddatenzwischenspeichereinrichtungs-Auswähleinrichtung (34), die Bilddatenzwischenspeichereinrichtungen (8a, 8b) zum Zuführen von Daten des unterteilten Bildes zu den Einheiten der Druckeinrichtung auswählt;
    eine Druckeinrichtungs-Auswähleinrichtung (33), die auswählt, an welche Einheit der Druckeinrichtung ein Ausgang von der Bilddatenzwischenspeichereinrichtung ausgegeben wird;
    eine Vorhersageeinrichtung (5), die eine Zuführ-und-Verarbeitungs-Zeit durch die Bilddatenzuführeinrichtungen (4a, 4b) vorhersagt; und
    eine Bilddatenzuführ-Steuereinrichtung (7), die bewirkt, dass die entsprechende Bilddatenzuführeinrichtung (4a, 4b) entsprechend der vorhergesagten Zuführ-und-Verarbeitungs-Zeit die Daten des unterteilten Bildes aus Farbkomponenten von der der Druckverarbeitungs-Anfangszeit durch die Einheiten der Druckeinrichtung (9Y, 9M, 9C, 9K) vorangehenden Zeit an unveränderlich der gleichen Bilddatenzwischenspeichereinrichtung zuführt.
  13. Bilderzeugungsvorrichtung nach einem der Ansprüche 1, 2, 9, 10, 11 oder 12, die des Weiteren eine Zuführpapier-Steuereinrichtung umfasst, die die Zuführpapier-Zeitsteuerung für Bögen auf der Basis eines Zustandes verzögert, in dem die zu druckenden Daten des unterteilten Bildes noch nicht in der Bilddatenzwischenspeichereinrichtung gespeichert sind, um so die Druckanfangszeit der Druckeinrichtung zu verzögern.
  14. Bilderzeugungsvorrichtung nach einem der Ansprüche 1, 2, 9, 10, 11 oder 12, wobei die Vorhersageeinrichtung (5) eine Zuführanfangszeit der Daten des unterteilten Bildes bestimmt, indem sie die Zeit von der Druckanfangszeit der Daten des letzten unterteilten Bildes einer abschließend zu druckenden Seite vor dem Druckvorgang durch die Druckeinrichtung an zurückverfolgt, und
    die Bilddatenzuführ-Steuereinrichtung (7) die Anzahl von Bilddatenzuführeinrichtungen und die Menge an Bilddatenzwischenspeichereinrichtungen in jeder Zeiteinheit berechnet, um so die Druckmöglichkeit in der Druckeinrichtung zu prüfen, wobei, wenn das Drucken unmöglich ist, die Druckanfangszeit durch die Druckeinrichtung verzögert wird, um das Drucken zu ermöglichen.
  15. Bilderzeugungsvorrichtung nach einem der Ansprüche 2, 10 oder 12, wobei die Vorhersageeinrichtung (5) eine Zuführanfangszeit der Daten des unterteilten Bildes aus Farbkomponenten bestimmt, indem sie die Zeit von der Druckanfangszeit der Daten des letzten unterteilten Bildes von Farbkomponenten einer abschließend zu druckenden Seite vor dem Druckvorgang durch die Druckeinrichtung (9, 9Y, 9M, 9C, 9K) an zurückverfolgt, und
    die Bilddatenzuführ-Steuereinrichtung (7) die Anzahl von Bilddatenzuführeinrichtungen (4a, 4b) und die Menge an Bilddatenzwischenspeichereinrichtungen (8a, 8b) in jeder Zeiteinheit berechnet, um so die Druckmöglichkeit in der Druckeinrichtung (9, 9Y, 9M, 9C, 9K) zu prüfen, wobei, wenn das Drucken unmöglich ist,
    die Druckanfangszeit durch die Druckeinrichtung (9, 9Y, 9M, 9C, 9K) verzögert wird, um das Drucken zu ermöglichen.
EP96116348A 1995-10-19 1996-10-11 Bilderzeugungsgerät Expired - Lifetime EP0769756B1 (de)

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JP296155/95 1995-10-19
JP7296155A JP2993411B2 (ja) 1995-10-19 1995-10-19 画像形成装置

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EP0769756A2 EP0769756A2 (de) 1997-04-23
EP0769756A3 EP0769756A3 (de) 1998-01-14
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US6488423B1 (en) 1999-11-03 2002-12-03 Toshiba Tec Kabushiki Kaisha Synchronous printing
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US7898695B1 (en) 2000-10-06 2011-03-01 Lexmark International, Inc. Method of compensating for electronic printhead skew and bow correction in an imaging machine to reduce print artifacts
US6683634B2 (en) * 2001-12-14 2004-01-27 Kabushiki Kaisha Toshiba Image forming apparatus of a 4-series drum configuration
JP4340120B2 (ja) * 2002-10-29 2009-10-07 株式会社リコー 画像形成装置、記憶領域取得方法
JP4541083B2 (ja) * 2004-09-21 2010-09-08 株式会社リコー 光書き込み装置および画像形成装置
JP2006333110A (ja) * 2005-05-26 2006-12-07 Konica Minolta Business Technologies Inc カラー画像形成装置
JP5137490B2 (ja) * 2007-07-30 2013-02-06 キヤノン株式会社 画像形成装置
JP5100238B2 (ja) * 2007-07-30 2012-12-19 キヤノン株式会社 画像形成装置
JP4989548B2 (ja) * 2008-04-22 2012-08-01 キヤノン株式会社 データ変換装置及びその制御方法
JP6834259B2 (ja) * 2016-08-31 2021-02-24 株式会社リコー 画像投影システム、情報処理装置、画像投影方法及びプログラム

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JP3721612B2 (ja) * 1995-09-08 2005-11-30 富士ゼロックス株式会社 画像形成装置

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EP0769756A2 (de) 1997-04-23
JP2993411B2 (ja) 1999-12-20
TW334543B (en) 1998-06-21
KR970022600A (ko) 1997-05-30
JPH09116706A (ja) 1997-05-02
KR100202740B1 (ko) 1999-06-15
DE69618312T2 (de) 2002-08-08
EP0769756A3 (de) 1998-01-14
DE69618312D1 (de) 2002-02-07
US5978561A (en) 1999-11-02

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